Sounds great! Perfectly efficient! But the important caveat is that heat pumps are (effectively) more than 100% efficient. They can take 100 watt of electricity to transfer 300 watts of heat from outside to inside.
In theory, you could build a system which uses solar power to mine bitcoin during the day, and store that heat somewhere (like an underground tank of water) until you need to warm your house at night.
I admire people for finding efficient ways to take advantage of the wasteful energy generated by mining, but i also hate the fact that innovations like this could keep Bitcoin alive for decades when it should have died a long time ago along with PoW...
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